[PATCH] D157074: [clang][ExprConst] Add RHS source range to div by zero diags

[Timm Bäder via Phabricator via cfe-commits]

tbaeder created this revision.
tbaeder added reviewers: aaron.ballman, erichkeane, shafik, cor3ntin, hazohelet.
Herald added a project: All.
tbaeder requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157074

Files:
  clang/lib/AST/ExprConstant.cpp
  clang/lib/AST/Interp/Interp.h
  clang/test/Misc/constexpr-source-ranges.cpp


Index: clang/test/Misc/constexpr-source-ranges.cpp
===================================================================
--- clang/test/Misc/constexpr-source-ranges.cpp
+++ clang/test/Misc/constexpr-source-ranges.cpp
@@ -23,3 +23,16 @@
 }
 static_assert(ints(1, div(true, false), 2, div(false, true)) == 1, "");
 // CHECK: constexpr-source-ranges.cpp:24:23:{24:23-24:39}
+
+
+constexpr int zero() {
+  return 0;
+}
+constexpr int divByZero() {
+  return 1 / zero();
+}
+static_assert(divByZero() == 0, "");
+/// We see this twice. Once from sema and once when
+/// evaluating the static_assert above.
+// CHECK: constexpr-source-ranges.cpp:32:12:{32:14-32:20}
+// CHECK: constexpr-source-ranges.cpp:32:12:{32:14-32:20}
Index: clang/lib/AST/Interp/Interp.h
===================================================================
--- clang/lib/AST/Interp/Interp.h
+++ clang/lib/AST/Interp/Interp.h
@@ -152,8 +152,9 @@
 template <typename T>
 bool CheckDivRem(InterpState &S, CodePtr OpPC, const T &LHS, const T &RHS) {
   if (RHS.isZero()) {
-    const SourceInfo &Loc = S.Current->getSource(OpPC);
-    S.FFDiag(Loc, diag::note_expr_divide_by_zero);
+    const auto *Op = cast<BinaryOperator>(S.Current->getExpr(OpPC));
+    S.FFDiag(Op, diag::note_expr_divide_by_zero)
+        << Op->getRHS()->getSourceRange();
     return false;
   }
 
Index: clang/lib/AST/ExprConstant.cpp
===================================================================
--- clang/lib/AST/ExprConstant.cpp
+++ clang/lib/AST/ExprConstant.cpp
@@ -2810,7 +2810,8 @@
 /// Perform the given binary integer operation.
 static bool handleIntIntBinOp(EvalInfo &Info, const Expr *E, const APSInt &LHS,
                               BinaryOperatorKind Opcode, APSInt RHS,
-                              APSInt &Result) {
+                              APSInt &Result,
+                              SourceRange RHSRange = SourceRange()) {
   bool HandleOverflowResult = true;
   switch (Opcode) {
   default:
@@ -2831,7 +2832,7 @@
   case BO_Div:
   case BO_Rem:
     if (RHS == 0) {
-      Info.FFDiag(E, diag::note_expr_divide_by_zero);
+      Info.FFDiag(E, diag::note_expr_divide_by_zero) << RHSRange;
       return false;
     }
     // Check for overflow case: INT_MIN / -1 or INT_MIN % -1. APSInt supports
@@ -3070,8 +3071,9 @@
       else if (BinaryOperator::isComparisonOp(Opcode))
         Success = handleCompareOpForVector(LHSElt, Opcode, RHSElt, EltResult);
       else
-        Success = handleIntIntBinOp(Info, E, LHSElt.getInt(), Opcode,
-                                    RHSElt.getInt(), EltResult);
+        Success =
+            handleIntIntBinOp(Info, E, LHSElt.getInt(), Opcode, RHSElt.getInt(),
+                              EltResult, E->getRHS()->getSourceRange());
 
       if (!Success) {
         Info.FFDiag(E);
@@ -12892,7 +12894,7 @@
   APSInt Value(Info.Ctx.getIntWidth(E->getType()),
                E->getType()->isUnsignedIntegerOrEnumerationType());
   if (!handleIntIntBinOp(Info, E, LHSVal.getInt(), E->getOpcode(),
-                         RHSVal.getInt(), Value))
+                         RHSVal.getInt(), Value, E->getRHS()->getSourceRange()))
     return false;
   return Success(Value, E, Result);
 }


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